Tungsten Oxide Product Morphology Change

Tungsten trioxide at 70℃. Calcined in air at APT obtained. Blue tungsten oxide was obtained in 404 APT seven reduction with nitrogen. Purple tungsten oxide at 470℃ under a hydrogen mixed with nitrogen gas (at 81℃ saturated with water vapor) reduction obtained, another WO2. Two samples will be a stoichiometric amount of the three The mixture of tungsten and tungsten oxide at 980℃ calcination under an atmosphere of pure hydrogen synthesis, both purple tungsten oxide by x-ray diffraction and identified as pure WO_2.2. Brown tungsten oxide (WOZ) is tungsten trioxide in the manufacture of WO_2.2 reduction under reducing conditions after a long period.

1.Paratungstate reduction was due to tungsten metal powder particles may have a shape of APT, it should pay attention to the morphology of APT. We APT having nearly cubic or monoclinic equiaxed grain structure, the crystal has some cracks.

2. The blue tungsten oxide decomposition at 404℃ and hydrogen atmosphere APT blue tungsten oxide obtained in morphology. The overall shape and APT same, but the blue tungsten oxide particles have more cracks than APT, some particles are also broken for a few. APT tungsten trioxide we used to get, and its appearance is very similar with APT.

3.Purple oxide, tungsten oxide, tungsten purple WO₂ morphology. Compared with the blue tungsten oxide, its appearance has changed significantly. Each piece by a large number of small columnar arrangement messy crystals. However, the entire collection of WO_2.72 small columnar grain morphology still has the APT.

4. Brown tungsten oxide morphology pure tungsten dioxide. This is the APT tungsten dioxide as raw material to go through the blue tungsten oxide and tungsten oxide phase purple system. Most WO_2.72 columnar crystals into a sleek flat particles.

In the oxidation of hydrogen reduction process of tungsten, tungsten oxide may arise have their specific morphology, but it still has the secondary particles tend to leave iron tungstate appearance. During the restore process, the changing size of the particles. Size tungsten powder in a considerable extent, depends on the reduction of the size of tungsten oxide intermediates. From blue or purple oxide, tungsten oxide, tungsten to tungsten oxide reduction this stage, tungsten powder particle size has a decisive impact.

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